class ReadmeYard

# File lib/readme_yard.rb, line 46
def self.call(arg, options)
  readme_yard = ReadmeYard.new

  case arg
  when "build"
    readme_yard.build(options: options)
  when "doc"
    readme_yard.doc(options: options)
  else
    puts TTY::Markdown.parse(readme_yard.command_line_usage)
  end
rescue Error => e
  puts TTY::Markdown.parse(e.message)
end

# File lib/readme_yard.rb, line 39
def self.hello_world
  "Hello 🌎 🌍 🌏"
end

# File lib/readme_yard.rb, line 67
def self.lookup_tag_class(tag_name)
  TAG_CLASS_LOOKUP[tag_name]
end

# File lib/readme_yard.rb, line 71
def initialize
  @readme_path = "./README.md"
  @readme_yard_path = "./README_YARD.md"
end

# File lib/readme_yard.rb, line 107
def build(options: "-nq")
  find_or_upsert_yardopts
  run_yardoc(options: options)
  File.write(readme_path, gsub_tags!(readme_yard_md))
end

# File lib/readme_yard.rb, line 90
def command_line_usage
  yard_parse_this_file
  yard_object = YARD::Registry.at("#{self.class.name}##{__method__}")
  yard_tags = yard_object.tags(:readme)
  "\n#{ReadmeTag.format_markdown(yard_object, yard_tags)}\n\n"
end

# File lib/readme_yard.rb, line 116
def doc(options: "-q")
  build(options: options || "-q")
end

# File lib/readme_yard.rb, line 120
def run_yardoc(options: "-nq")
  YARD::CLI::Yardoc.run(options || "-nq")
end

# File lib/readme_yard.rb, line 159
def build_yardopts_text_addition(yardopts_text)
  return if yardopts_text.match?(/\s*--plugin\s+readme\W/)

  readme_plugin_opts = default_readme_plugin_opts(yardopts_text)
  case yardopts_text
  when /\s*--markup\s+markdown/, /\s*-m\s+markdown/
    readme_plugin_opts
  when /\s*--markup\s/, /\s*-m\s/
    warn_about_supported_markdown
    readme_plugin_opts
  else
    readme_plugin_opts << "--markup markdown\n"
  end
end

# File lib/readme_yard.rb, line 132
def create_new_readme_yard_md
  new_readme_yard_md = File.read(readme_path) if File.exist?(readme_path)
  new_readme_yard_md ||= default_readme_yard_md
  File.write(readme_yard_path, new_readme_yard_md)
  new_readme_yard_md
end

# File lib/readme_yard.rb, line 180
def create_yardopts_file
  File.write(YARDOPTS_FILE, "--plugin readme\n--markup markdown\n")
end

# File lib/readme_yard.rb, line 174
def default_readme_plugin_opts(yardopts_text)
  readme_opts = +""
  readme_opts << "\n" unless yardopts_text.lines.last.include?("\n")
  readme_opts << "--plugin readme\n"
end

# File lib/readme_yard.rb, line 139
def default_readme_yard_md
  yard_parse_this_file
  +"Welcome to the README_YARD 🌿 🥏\n\n" \
   "Check out this project's" \
   " [README](https://github.com/mattruzicka/readme_yard#readme)" \
   " for usage.\n\n{@readme ReadmeYard#default_readme_yard_md}"
end

# File lib/readme_yard.rb, line 217
def extract_object_path(tag_string)
  tag_string.match(/\s(\b.+)}/).captures.first
end

# File lib/readme_yard.rb, line 213
def extract_tag_name(tag_string)
  tag_string.match(/{@(\w+)\s/).captures.first
end

# File lib/readme_yard.rb, line 149
def find_or_upsert_yardopts
  File.exist?(YARDOPTS_FILE) ? update_yardopts_file : create_yardopts_file
end

# File lib/readme_yard.rb, line 189
def format_tag_markdown(string)
  first_char = string[0]
  return string if first_char == "`"

  tag_name = extract_tag_name(string)
  object_path = extract_object_path(string)
  yard_object = YARD::Registry.at(object_path)
  raise Error.object_not_found(object_path, tag_name) unless yard_object

  yard_tags_markdown = format_yard_tags_markdown(yard_object, tag_name, string)
  "#{first_char if first_char != "{"}#{yard_tags_markdown}"
end

# File lib/readme_yard.rb, line 202
def format_yard_tags_markdown(yard_object, tag_name, string)
  yard_tags = yard_object.tags(tag_name)
  if yard_tags.empty?
    warn_about_yard_tags_not_found(yard_object, tag_name)
    string
  else
    tag_class = self.class.lookup_tag_class(tag_name)
    tag_class.format_markdown(yard_object, yard_tags)
  end
end

# File lib/readme_yard.rb, line 184
def gsub_tags!(markdown)
  markdown.gsub!(/([^`]|^)(\{@\w+\s.+\})/) { |string| format_tag_markdown(string) }
  markdown
end

# File lib/readme_yard.rb, line 126
def readme_yard_md
  return File.read(readme_yard_path) if File.exist?(readme_yard_path)

  create_new_readme_yard_md
end

# File lib/readme_yard.rb, line 153
def update_yardopts_file
  text = File.read(YARDOPTS_FILE)
  text_addition = build_yardopts_text_addition(text)
  File.open(YARDOPTS_FILE, "a") { |f| f.write(text_addition) } if text_addition
end

# File lib/readme_yard.rb, line 227
def warn_about_supported_markdown
  Logger.warn "\n*Readme Yard* works best with markdown." \
              "\nConsider adding `--markup markdown` to your `.yardopts` file.\n\n"
end

# File lib/readme_yard.rb, line 232
def warn_about_yard_tags_not_found(yard_object, tag_name)
  Logger.warn "The `@#{tag_name}` *Readme Yard* tag is missing from #{yard_object}."
end

# File lib/readme_yard.rb, line 221
def yard_parse_this_file
  gem_spec = Gem::Specification.find_by_name("readme_yard")
  current_file_path = File.join(gem_spec.full_gem_path, "lib", "readme_yard.rb")
  YARD.parse(current_file_path)
end